This one...
A man comes home one day to find his wife has slept with the milkman. 'For Christ's sake! Not again!' he screams as he throws the milkman out, before turning to his wife, 'I swear, if I catch you in bed with the milkman one more time, I'm going to pluck out every single one of your pubes!'
She promises it'll never happen again and he calms down.
The next day, he goes off to work, and his wife spots a new milkman making his rounds, he looks a little retarded, but she's suddenly feeling extremely horny.
The milkman rings the doorbell, she opens the door and leans seductively against the frame, 'would you like to come in?' she asks.
'Only for a chocolate biscuit.' replies the little milkman. She hands him a biscuit and leads him in.
'Would you like to come upstairs?' she asks.
'Only for a chocolate biscuit,' he replies, and catching onto the theme she takes him and a packet of chocolate biscuits upstairs.
'Take off my clothes and have sex with me.' she tells him, handing him another biscuit.
They go at it, she's enjoying herself loudly, and he's pumping away, while scoffing down as many chocolate biscuits as he can manage.
Suddenly, the wife hears the front door closing downstairs, 'shit, my husband must be home!' she exclaims, and pushes the milkman into a cupboard just in time for her husband to walk through the door.
Seeing the mess on the bed, her husband knows exactly what she's been up to, 'RIGHT. That does it, get on the bed!' he shouts, producing some tweezers from his pocket.
He then slowly and painfully plucks nearly every hair out of her, but the last one just will not budge, he pulls, tugs and yanks, but it just will not budge.
'Come out you little bastard!' he shouts.
'Only for a chocolate biscuit,' comes a muffled voice from the cupboard.

I edited the racism out of this joke, I learned it in Primary School!
(tiger blood and Adonis DNA, Mon 7 Apr 2008, 17:28, Reply)